TI LM5170PHPR

The LM5170 controller provides the high-voltage and precision components essential for dual-channel bidirectional converters. The device regulates average current between the high-voltage and low-voltage ports in the direction specified by the DIR input signal. The current regulation level can be programmed via analog or digital PWM inputs. Dual-channel differential current sense amplifiers and dedicated per-channel current monitors achieve a typical current accuracy of 1%. Robust 5A half-bridge gate drivers support parallel MOSFET switches rated at 500W/channel or higher. Diode emulation mode for synchronous rectifiers prevents negative current flow while also supporting improved light-load efficiency through discontinuous operation mode. General-purpose protection features include cycle-by-cycle current limiting, HV and LV port overvoltage protection, MOSFET fault detection, and overtemperature protection. An innovative average current mode control scheme maintains constant loop gain, allowing a single R-C network to compensate both boost and buck conversions. The oscillator frequency is adjustable up to 500kHz and can synchronize to an external clock. Two LM5170 controllers can be cascaded for 3-phase or 4-phase operation, or multiple controllers can be synchronized with phase-shifted clocks for higher phase count operation, enabling multiphase parallel operation. A logic-low on the UVLO pin disables the LM5170 in a low-current shutdown mode.

• Functional Safety documentation available to assist with functional safety system design for high-power industrial dual-battery systems
• Maximum ratings of 100V and 65V for HV and LV ports respectively
• 1% precision bidirectional current regulation
• 1% precision channel current monitoring
• 5A peak half-bridge gate driver
• Multi-phase operation via stackable functionality
• Diode emulation to prevent negative current
• Programmable or adaptive dead-time control
• Programmable oscillator frequency with optional external clock synchronization
• Dual-channel enable control inputs
• Analog and PWM current control
• Programmable peak current limit
• Programmable soft-start timer
• Phase addition or removal via EN2
• HV and LV port overvoltage protection
• MOSFET fault detection and circuit breaker control at startup
• Thermal shutdown

• Battery tester
• Bidirectional battery management system
• Backup battery-powered converter
• Stackable buck or boost converter
• Negative/positive voltage converter